Triquetral fracture - pooping duck sign
Presentation
Wrist pain post trauma.
Patient Data
Age: 25 years
Gender: Male
From the case:
Triquetral fracture - pooping duck sign
X-ray
Lateral
A fragment of bone is present along the dorsal aspect of the proximal carpal row, adjacent to the dorsal cortex of the triquetrum.
From the case:
Triquetral fracture - pooping duck sign
Diagram
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Lateral
The scaphoid is outlined in yellow, the lunate in blue, and the visualized dorsal portion of the triquetrum in green. These structures combine to resemble a duck, with the avulsed triquetral fragment resembling poop from the duck, as indicated.
From the case:
Triquetral fracture - pooping duck sign
Diagram
Frontal
Triquetral fracture is common by virtue of the fact that the dorsal stabilizing ligaments of the wrist share a common attachment site at the dorsal cortex of the triquetrum.
Case Discussion
I don't recall where I learned the pooping duck sign, but here it is in all its glory. Enjoy.